Repair and operation of the Mercedes S-Class W-220 c car of 1998 - Check of a condition of tires and pressure in them. Designation of tires and disks of wheels. Rotation and replacement of wheels//S-class Mercedes / keramicheskoy-plitki.ru

Check of a condition of tires and pressure in them. Designation of tires and disks of wheels. Rotation and replacement of wheels

PERFORMANCE ORDER

1. Depending on model and equipment tires and disks of the various sizes can be established. Disks have depth of a press fitting of 38 mm. Depth of a press fitting is a distance from the disk middle to a persistent surface of a wheel on a brake disk or a drum. Wheel bolts for steel and light-alloy wheels have the identical sizes.

At installation of light-alloy wheels of other producers bolts of other sizes can be demanded. The equipment is improved. Can be so that for older models other values of pressure in tires are admissible. The sizes specified in documents to the car are defining.

2. At a sports manner of driving it is recommended to increase pressure in lobbies and back tires by 0.2 atm. At increase in pressure it is necessary to start with a base-line value for various conditions of loading. 3. Winter tires as a rule have pressure upon 0.2 atm. above than summer. It is necessary to consider recommendations of manufacturers of winter tires. 4. As winter tires have restriction till speed, in sight of the driver the plate with the indication of the maximum speed should be strengthened.

Designations of disks

Example: 6 J x 15

6 width of a disk in inches J alphabetic reference of height and contour onboard закраины disk rims x designation of an integral deep disk 15 diameter of a disk in inches

Admissible lateral palpation on onboard закраине a disk: 0.8 mm;

Admissible radial palpation on the landing shelf of a disk: 0.5 mm.

Designation of tires

Example: 195/70 R 14 89 H

195 width of the tire in mm /70 the relation of height to width (the height of cross-section section of the tire makes 70 % from width) If hotel data on the relation of width to height are absent (for example, 175 R 14), mean are a question of the "normal" relation. It makes 82 %. N class of speed, N: to 210 km/h (on new tires it is brought not always). R radial design 14 size of a disk in inches 89 parameter of loading capacity

If between data 14 and 89 there is M+S designation, it is a question of tires with a winter protector.

N designation of admissible maximum speed.

The letter of speed stands up for in the size of the tire. Symbols of speed belong both to summer, and to winter tires.

Date of manufacturing of the tire costs on the tire in a code of the producer

Example: DOT CUL2 UM8 of 4600 TUBELESS DOT Department of Transportation (Ministry of Transport of the USA) CU reduction of the name of the manufacturer L2 size of the tire UM8 tire execution 4600 date of manufacturing - the 46th working week 2000 TUBELESS tubeless (TUBETYPE - the tire with the chamber)

Regular check of a condition of tires will allow you to avoid the troubles connected with stops in a way because of the lowered wheel. Besides, such checks give valuable information on possible problems with a steering and a suspension bracket before emergence in them serious damages.

Tires are equipped with the built-in strips of indication of wear of a protector which are bared at decrease in depth of a protector to 1.6 mm then tires are considered as the worn-out. This size represents minimum admissible depth of a protector; it is in most cases recommended to replace the tires, which depth of a protector of 2 mm and less. It is also possible to determine depth of a protector by the simple and inexpensive adaptation known under the name of a measuring instrument of depth of a protector.

Pay attention to any unusual wear of protectors. Such defects of a protector as cavities, cambers, uploshcheniye and stronger wear on the one hand indicate violation of corners of installation of forward wheels and/or wheel balancing. At identification any of the listed defects it is necessary to address for their adjustment in a shinomontazhny workshop.

Carefully check the tire on existence of cuts, punctures and got stuck nails or buttons. Sometimes after a tire protykaniye a nail it still some time holds pressure or lowers very slowly.

At suspicion on existence such «a slow puncture» at first check tightness of a nipple of the gate of a rating. Then examine a protector on presence at it got stuck strangers of subjects or closed up before the punctures which have started over again to pass air. If there is a suspicion that there is a puncture, to make sure of its existence it is possible, having moistened a suspected site with soap water. In the presence of leak solution will start to bubble. If not too big, the tire it is usually possible to repair a puncture in any shinomontazhny workshop.

Carefully examine internal lateral surfaces of tires on existence of signs of leakage of brake liquid on them. If those are available, immediately check brake system.

Maintenance in tires of the correct pressure increases term of their service, helps to save fuel and improves the general comfort of movement. The special manometer is necessary for check of pressure.

Recommendations: Always keep an exact manometer in the ware box. Indications of the manometers which have been built in nozzles of air hoses at stations of service, often happen inexact.

Always check pressure on cold tires (i.e. to a trip on the car). If to check pressure on the warm or warmed-up tires, it will lead to overestimate of indications of a manometer because of thermal expansion of tires. In this case never it is necessary to lower pressure since after tire cooling it will appear lower than norm.

Screw together a protective cap from the gate of a rating acting from a disk of a wheel or from a cap of a nave, then densely press to the gate a manometer nozzle. Consider instrument readings and compare them with recommended in Specifications. Do not forget to establish into place a protective cap for hit prevention in the mechanism of a nipple of dirt and moisture. Check pressure in all four tires and if necessary pump up them to the recommended value of pressure.

Do not forget to support demanded pressure and in a spare wheel. Check of pressure of air in tires

Check of pressure of air should be carried out only on cold tires.

PERFORMANCE ORDER

1. Unscrew a gate cap.

2. Pressure of air in tires is checked once a month, and also at carrying out service (including spare a wheel). 3. Besides, pressure of air are necessary for checking before each long trip since temperature load of tires in this case increases. 4. Necessary pressure of air in tires is given on a sticker being on inside of a cover of a fuel tank.

At use of winter tires pressure of air should be increased by 0.2 atm. in relation to the established value.

5. Pressure of air of narrow tires of a spare wheel is specified on боковине a disk.

Pressure of air in tires changes depending on change of temperature of air on 10°С approximately on 0.1 atm. It should be considered at monitoring procedure of pressure of air in tires in garage — especially in the winter.

Example:

Temperature in garage near + 20°С Temperature of external air near 0°С Established pressure of air in tires = the ordered pressure of air of +0.2 atm.

Values of pressure of air in the tires, given for small loading of the car, are the minimum values providing comfortableness of movement.

The air elevated pressure in the tires, provided at the raised loading of the car, positively affects controllability of the car as well at small loading and is quite admissible. Smoothness of a kacheniye thus, however, decreases a little.

Check of the gate of tires

Gate of tires

1 both 2 — Rubber and metal caps 3 — the Gate

4 — the gate Case

PERFORMANCE ORDER

Applied extension pieces of gates should be checked on existence of damages and the pollution conducting to a leakage. If necessary it is necessary to replace extension pieces.

1. Unscrew a protective cap and the extension piece. 2. Put on the gate a small amount of soap solution or a saliva. If the air vial is formed, tighten an insert the 3rd protective cap 2.

It is necessary to apply only a protective cap to pulling up of the gate 2. 1 rubber protective caps, 4th gate.

3. Again check the gate. If there are vials and the gate it is not possible to tighten, it it is necessary to replace (work HUNDRED). 4. Surely again establish into place a protective cap.

Examples of characteristic wear of protectors of tires

Lateral wear

Insufficient pressure in the tire leads to its overheat at movement owing to an excessive deflection therefore the protector does not nestle sufficiently on a road surface. It leads to loss of coupling with the road and to excessive wear of a protector, not to mention danger of an exit of the tire out of operation as a result of an overheat.

Check and adjust pressure.

Wrong disorder of wheels (wear on the one hand)

Repair or replace suspension bracket details.

Too sharp turns

Reduce speed!

Central wear

Superfluous pressure

Superfluous pressure in the tire results in the accelerated wear of the central part of a protector, decrease in coupling with darling to more rigid movement and increase of danger of fatal damage of a slope.

Check and adjust pressure.

If you had to pump up tires for transportation of heavy cargoes to specified for this purpose in Specifications of value of pressure, do not forget after that to pit it upon transition to a normal mode of operation.

Non-uniform wear

Tires of forward wheels can non-uniformly wear out as a result of violation of adjustment of corners of installation of wheels. To check and adjust corners of installation it is possible for a moderate payment in the majority of shinomontazhny workshops.

Wrong disorder or выбег

Repair or replace suspension bracket details.

Defect of a suspension bracket

Repair or replace suspension bracket details.

Wheels are debalanced

Make balancing of wheels.

Convergence of forward wheels is incorrectly established

Adjust corners of installation of forward wheels.

The Obtrepannost of edges of a pattern of the protector, being a wear sign, best of all comes to light to the touch.

Rotation of wheels

Rotation of wheels is authorized only at the identical size of lobbies and back wheels.

Rotation of wheels make depending on wear of tires each 5000-10000 km. Thus keep the direction of rotation of wheels.

Rotation is necessary for making before emergence of characteristic signs of wear of tires. A characteristic sign of wear at tires of forward wheels is wear of a humeral zone of a protector, and at tires of back wheels — the protector middle.

At each rotation of wheels it is necessary to clear carefully them from the inside. After rotation of wheels check and if necessary modify pressure of air in tires (see above).

Bolts of fastening of wheels can weaken, if they were not tightened with the moment of an inhaling specified in Specifications. After replacement of wheels check the inhaling moment.

Apply only firm bolts of fastening «MB» designated by a star of "Mercedes-Benz". Other bolts can unscrew.

Spare wheel of the facilitated design

At tire damage the spare wheel of the facilitated design can be used as a normal wheel; it is recommended to replace as soon as possible, however, it with a normal wheel as it is calculated on limited run as much as possible to 20 000 km.

At replacement of tires the tire of a spare wheel can be mounted on the driving wheel if the tire corresponds to execution of tires of driving wheels. If the tire is more senior than 6 years, it is recommended to be applied only at tire damage.

Models with tires 245/45R18:

If the spare wheel of the facilitated design is mounted, owing to the various sizes of tires it is necessary to reckon with change dynamic property of the car. Conform style of driving to a road situation.

As soon as possible replace a spare wheel of the facilitated design with a usual wheel.

Models with an AMG firm complete set

There is a danger of failure!

If the spare wheel of the facilitated design is mounted, owing to the various sizes of tires it is necessary to reckon with change of dynamic properties of the car. Conform style of driving to this situation.

It, therefore, is provided only for short-term using at observance of the ordered pressure of air in tires and the maximum speed of 80 km/h.

Operation with more, than one spare wheel of the facilitated design is inadmissible.

Replacement of wheels

The automobile jack is intended only for short-term lifting of the car at wheel replacement.

The basic platform of an automobile jack should be firm and equal. In case of friable soil use a lining for an automobile jack.

Under the car it is necessary to apply a false trestle to work.

PERFORMANCE ORDER

1. Put the car, whenever possible, on an equal platform. Strongly press a pedal of the parking brake. It is impossible to release the parking brake while the car is lifted. 2. The lever of the AT selector transfer to the situation "R". Protect the car from a spontaneous otkatyvaniye, having enclosed a protivootkatny emphasis, etc. 3. On the equal road: enclose an emphasis under diagonalno located wheel in front and behind. 4. On liftings and descents: enclose an emphasis under both wheels of other bridge in a downward direction on descent. 5. From a set of the onboard tool take out a demountable key for wheels from two parts and bring together him.

6. Weaken bolts of fastening of wheels a key, but yet do not unscrew them completely.

7. Uncover an opening for installation of an automobile jack.

Openings for installation of an automobile jack are behind wheel niches of forward wheels and before wheel niches of back wheels.

8. A basic finger of a jack completely move into an opening for jack installation.

The automobile jack should stand always vertically — as well on slopes.

9. Lift the car to a wheel separation from soil. 9. For prevention of a soskalzyvaniye of the car a basic finger of a jack completely (against the stop) insert into an opening for installation 10. Turn out the top bolt of fastening. Aligning pin-1-from a set of the onboard tool screw in in a carving opening. Other bolts for fastening of wheels turn out. Do not put bolts of fastening of wheels on sand or in dirt.

1 — Are used for all wheels offered by plant

11. Remove a wheel.

Bolts of fastening of wheels

PERFORMANCE ORDER

1. Replace bolts of fastening of the wheels, having damages or rust traces. 2. Do not oil bolts or konsistentny greasing. In case of damage of a carving to a nave of a wheel to continue movement it is impossible. It is necessary to address on Mercedes-Benz station. 3. Make cleaning of a surface of a prileganiye of a wheel and a nave. Apply only firm bolts of fastening «MB» designated by a three-final star of "Mercedes-Benz".

4. Get and press a wheel.

5. Screw bolts of fastening of a wheel and slightly tighten. 6. Unscrew aligning pin and screw the last bolt of fastening of a wheel.

7. Lower the car. Remove an automobile jack and establish a cover on an opening for jack installation.

8. Evenly tighten all bolts of fastening of a wheel. The scheme of an inhaling is provided on an accompanying illustration. The moment of an inhaling is specified in Specifications.

There is a danger of failure!

Bolts of fastening of wheels can weaken, if they were not tightened the every moment. Therefore surely check the inhaling moment right after replacement of wheels.

Before laying of an automobile jack in an additional compartment under a trunk floor turn a basic finger of a jack back almost to a support.

Disassemble a demountable key for wheels and place it in a set of the onboard tool.